In the following question out of the four options only one is correct, write the correct answer.
Arpita's present age is thrice of shilpa. If Shilpa's age three years ago was x, then Arpita's present age is:
(a) 3(x – 3)
(b) 3x + 3
(c) 3x – 9
(d) 3(x + 3)